Rotatable fastening device



Oct. 1, 1940.

J. F. G. CHOBERT ROTATABLE FATENING DEVICE Filed Nov. 2l, 15936 15% rmt-ys. I

Patented Oct. 1, 1940 BOTATABLE FASTENING DEVICE Jacques Francois Gabriel Chobert, Saint Etienne, France Application November 21, 1936, Serial No. 112,180

' In France November 28, 1935 4 Claims. (Cl. 24-221) The present invention relates to an improved fastening device suitable for securing inspection doors, panels and the like used on-arcraft, various vehicles and machinery.

An object of the invention is to provide a fastening device which maybe rapidly and easily engaged and disengaged and may be mounted near to the edge of the inspection panel or the like.

According to this invention a fastening. device for securing together overlapping elements by pressing surfaces of said elements into contact with each other comprises a socket for attachment to one of said elements, a manually operable member mounted for rotational and endwise movement within said socket, means carried by said. member adapted to engage the other of said overlapping elements, a spring urging said engaging means towards said element and adapted also to press together surfaces of the overlapping elements and means acting upon partial rotation of the manually operable niem-4 ber to lift the engaging means clear of said element to be secured.

A fastening device constructed in accordance with this invention allows the overlapping elements to disengage immediately on partial rotation of the manually operable member. It further allows the elements to be correctly located .after engaging and beforefinally securing the fastening device. 'TL

The invention will be more fully understood by reference to the drawing which illustrates two constructional forms of the improved fastening device.

In the drawing:

Figs. 1 land 2 are longitudinal sectional views of the fastening device. h

Figs. 3 to 10 and 13 and 14 are detail views of the various parts forming the fastening device illustrated in Figs. 1 and 2; Figs. 3 and 4 show the bolt; Figs. 5 -to 8 show the socket and a method of constructing it from a blank; Figs. 9 and 10 show the ramp blank and the ramp ready for insertion into the socket; Fig. 13 shows a locating washer and Fig. 14 afastening plate to be mounted on the element to be secured.

Figs. 11 and 12 show a modified arrangement of ram'p and cooperating means. Fig. 15 illustrates a modified construction.

VReferring to Figs. 1 to 14: A cylindrical socket 2 is provided with wings 31 and 32 by which it may be riveted to a vfixed element 4, conveniently a part of the structure to which a movable element I0 is tol be secured.

E key shaft.

A key shaft having a T head 8 is mounted in the socket 2 for rotational and endwise displacement. A compression spring 5, mounted on the shank of the' key shaft between a locking washer 8 and a pin 1 carried on the key shaft I, 5 tends to force the key shaft I in the direction f1.

The head 8 of the key shaft` I is adapted in one position to pass through a hole 9 in the element I lll and through a hole in a fastening plate (see Fig. 14) riveted vto the said ele- 10 ment I8. When the key shaft is rotated through a right-angle the branches |51, |52 of the head 8 of the key shaft I engage the said fastening plate Within thesocket 2 a circular ramp I3 is 15 mounted by spurs 231, 232 engaging slots 2I1, 2|2 in 'the end of the socket; said ramp is adapted. to cooperate with spurs I4 on the key shaft I, to displace same endwise upon rotation of the This branches |51, |52 of tI'e head 8' of the keyv shaft to engage or disengage the fastening plate II, the engagement being assisted by the spring 5 which acts to press the overlapping elements together by forcing the head 8 in the direction fr. 25

Means for holding the key shaft in the securing or releasing position comprises a locking washer 6 provided withspurs |81 and |82 which may engage slots 2|1, 2|2 or 221, 222 in the bottom of the socket 2; the slots 2|2 also 30 locate the ramp I3. The washer 6 is mounted on the key shaft I and is rotated therewith by means of a rectangular opening 25 which engages flats |11, |12 on the key shaft I. 'I'he spring 5 forces the locking washer 6 in the con- 35 trary direction to f1 so that the spurs |81, |82` engage the slots 221, 222 and 2I1, 2I2 at 'the positions` corresponding to securing and releasing respectively. l

When the fastening device is in the securing position the branches |51 and |52 of the head y 8 of the key shaft are urged towards the-fastening plate by the spring 5 and thus press the movable element I0 against the fixed element l.

To release the movable element I8 a turnscrew or like tool is inserted into'a slot I8 in the head 8 of the key shaft and the head 8 is rotated through a quarterl turn. This brings the branches |51 and |52 into a position in which 50 they may pass through the holes in the fastening plate I and movable element I Il to release the said movable elem t. At the same time the branches |51 and |52 a e lifted from the fastening plate II by the actiomof the ramp I3 todisplacement causes the im4 operating with the spur I4 to displace the key shaft l endwise. This displacement facilitates the securing and releasing of the movable element I0.

The socket 2 may be formed from a blank as shown in Figs. 7 and 8 or it may be formed in any other convenient way. The ramp Ameans associated with the socket may conveniently be of the form shown in Figures 9 and 10. l

A modified yarrangement of the ramp and cooperating means is shown in Figs. 11 and 12 which show a ramp |3a carried on a key shaft Iaadapted for cooperation with spurs 241, 24: on the interior of a socket 2a.

A modifledform of fastening device according to the present invention is illustrated in Fig. 15. A socket 42 is rigidly secured to a movable member 43. The interior of the socket 42 provides guiding means allowing rotation of a bolt 44 provided with a head 45.

The bolt 44 is urged in the direction fa by a compression spring 46 mounted on the bolt between the head 45 of the bolt 44 andi-the bottom of the socket 42. The lower end of the shank of the bolt 44 passes through the bottom of the socket 42 and a transverse arm 41, having two symmetrical up-turned limbs 411, 412 is secured to the part of the shank extending through the said socket 42. The limbs 411, 412 are adapted to engage depressions 481, 482 in a. fastening plate 48 mounted on a fixed member 50 and, being,

urged upwards by the spring 46, act to press the members 43 and 50 together thereby securingthem.

The head 45 of the bolt 44 is slotted at 451`to receive a turnscrew or like tool whereby the bolt may be rotated. The-fastening plate 48 and fixed member 50 are provided with apertures which permit the socket 42, bolt 44 and arm 41 to pass through said members when the bolt is rotated through 90 from the position shown in Flg. 15

thereby disengaging the movable member 43 from the xed member 50.

A ramp 5| formed on the lower end of the socket 42 and cooperating with a pin 48 arranged transversely of the bolt 44 acts to force the bolt 44 downwards against the action of the spring 46 to disengage the limbs 411, 412 from the depressions 481, 482 on rotation of the bolt 44. 'I'his arrangement facilitates disengagement of the device.

When the device is in the engaged position the head of the bolt 44 is in aposition generally level with the upper surface of the member 43.

What I claim is: A

1. A fastening device for securing together overlapping elements .by pressing surfaces of such elements into contact with each other, comprising a socket member for attachment to one of the elements and having associated ramp means. a shaft, adapted for manual rotation, axially slidable and rotatable in the socket member and having parts adapted to engage a 'second element to be Secured, a spring operative between the socket member and the shaft to urge the latter axially to cause such engagement of said parts, and pins mounted on the shaft and cooperating with the ramp means to cause disengagement of said parts from the second element on partial rotation of the shaft.

2. `A fastening device for securing together overlappingelements by pressing surfaces of such elements into contact with each other, comprising a socket member for attachment to one of the elements, ramp means associated with the socket member, a shaft carried in the socket member and having a T shaped head adapted for manual rotation and adapted, in one rotational position, to engage a second element to be secured, a spring acting axially between the shaft and the socket member to urge said head into engagement with said second element and pins mounted on the shaft and `cooperating with the ramp means, on partial rotation of the shaft, to displace the latter axially against the action of the spring.

3. A fastening device for securing together overlapping elements by pressing surfaces of such elements into contact with each other, comprising a. socket member for attachment to one oi. the elements, ramp means associated with the socket member, -a shaft carried in the socket member and having a T shaped head adapted for manual rotation and adapted, in one rotational position, to engage a second element to be secured, a spring acting axially between the shaft and the socket member to urge said head into engagement with saidv second element, and a toothed plate mounted on the shaft and urged by the spring to engage depressions in the end of the socket member to locate the shaft in the free or in the locked position.

4. A fastening device for securing together overlapping elements by pressing surfaces of such elements into contact with each other, comprising a socket member for attachment to one of the elements, and having associated ramp means, a shaft having a head adapted for manual rotation, axially sldable and rotatable in the socket member and provided with a transverse part having limbs adapted in one position to engagea second element to be secured, a spring operative between the socket member and the shaft to urge the latter axially to cause such engagement of said limbs, and pins mounted on the shaft and cooperating with the ramp means to cause dis'- engagement of said limbs from the second element on partial rotation of the shaft. V

JACQUES FRANCOIS GABRIEL CHO'BERT.

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